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Old 01-19-2019, 08:20 AM   #1
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Idle Issues (with video) 2009 Duratec 2.0

Hey Y'all,
I'm really at a standstill on this one.
Engine has had random rpm dips at idle. Normally stays aroun 600-700 but will randomly dip below 500 and feel like it's going to stall.

https://youtu.be/WGng_AOjANg

Happens at about 0:08, 0:28 and 0:34. There's no specific pattern to it.

Replaced the PCV valve and hose under the intake manifold with no luck.

I'm not sure what to try next. I can seemingly force this to happen by holding down the power window buttons, but it happens on its own regardless. Any ideas?


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Old 01-19-2019, 10:29 AM   #2
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Possible vacuum leak elsewhere.

If higher mileage engine even the a/c cycling on can do it if on defrost. Common when they get older.
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Old 01-19-2019, 02:31 PM   #3
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I think the valve cover gasket could use a replacement. Would this be enough to cause a vacuum leak? Is there an easy way to diagnose which vacuum line is problematic? I'm not hearing any hissing from the engine compartment.
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Old 01-19-2019, 09:47 PM   #4
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Leaking valve cover gasket doesn't create a vacuum leak.

Have you tried cleaning the throttlebody?
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Old 01-20-2019, 04:25 AM   #5
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When I replaced the PCV I took the throttle body off of the intake manifold and cleaned everything out of it. The problem only seems to be at idle. My next thought was to try new spark plugs and coils, but i wasn't sure if that made sense when the car is running fine with throttle.
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Old 01-20-2019, 08:17 AM   #6
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I had an issue with mine and believe it or not it was low on refrigerant and it was over cycling the AC system.

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Old 01-20-2019, 01:54 PM   #7
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rapid cycling of the A/C would cause issues at idle but not off idle.
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Old 01-21-2019, 08:27 AM   #8
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I agree that the AC is the likely culprit. However, it's -8 where I'm at, with no 60+ days in sight. Would I be smart to pull the AC relay until spring? Would there be any issue driving without it.
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Old 01-21-2019, 10:33 AM   #9
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Pulled the AC Relay and no changes. Is there another workaround for the time being until the temp increases? My next thought was to replace the plugs, coils and boots just to be sure it isn't a basic preventative maintenance issue. I'm on my third valve cover gasket and there is oil in the plug wells again 😬. Here's to hoping the PCV was the main cause of that issue. Back to the main topic, anyone have any other ideas before I jump in?
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Old 01-22-2019, 07:28 AM   #10
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I walked around back and it sounds like the Focus is misfiring, but again it's only at idle and sometimes upon acceleration.

https://youtu.be/FHRwC6L-N40

The interesting thing is that the exhaust is pulling in air every time this noise occurs.

Would you assume it's an ignition issue?
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